81400640

素因数分解:

$2^6\times 5^1\times {\mathrm{254377}}^1$

素因数の和:254394

約数の個数: 28

約数和(自身を含む): 193836036

約数和(自身を除く): 112435396

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 320, 254377, 508754, 1017508, 1271885, 2035016, 2543770, 4070032, 5087540, 8140064, 10175080, 16280128, 20350160, 40700320, 81400640]

約数ペア:

[(1, 81400640), (2, 40700320), (4, 20350160), (5, 16280128), (8, 10175080), (10, 8140064), (16, 5087540), (20, 4070032), (32, 2543770), (40, 2035016), (64, 1271885), (80, 1017508), (160, 508754), (320, 254377)]